ADE7878高精度三相电能测量IC

1、ADIADE7878高精度三相电表方案ADI公司的ADE7878是高精度三相电能测量IC,集成了串行接口和三个灵活的脉冲输出，包括有二阶Delta-SigmaADC,数字积分器，基准电路，以及进行总的有功，无功和表观能量测量以RMS计算所需要的所有信号处理采用固定功能的DSP来实现这些信号处理.ADE7878具有精度高，支持EN50470-1,EN50470-3,IEC62053-21,IEC62053-22andIEC62053-23,和三相三线或四线制兼容,测量误差小于0.1%,工作电压在2.4到3.7V.本文介绍ADE7878主要特性,功能方框图,总的有功和无功与表观电量累加框图,以及评

2、估板EVAL-ADE7878EB主要特性，方框图，电路图和材料清单BOM.TheADE7878isahighaccuracy,3-phaseelectricalenergymeasurementICwithserialinterfacesandthreeflexiblepulseoutputs.TheADE7878incorporatessecond-orderS-AADCs,adigitalintegrator,referencecircuitry,andallthesignalprocessingrequiredtoperformtotal(fundamentalandharmonic)a

3、ctive,reactiveandapparentenergymeasurement,fundamentalonlyactiveandreactiveenergymeasurementandrmscalculations.Afixedfunctiondigitalsignalprocessor(DSP)executesthissignalprocessing.TheADE7878issuitabletomeasureactive,reactive,andapparentenergyinvarious3-phaseconfigurations,suchasWYEorDELTAservices,w

4、ithboththreeandfourwires.TheADE7878providessystemcalibrationfeaturesforeachphase,thatis,rmsoffsetcorrection,phasecalibration,andgaincalibration.TheCF1,CF2andCF3logicoutputsprovideawidechoiceofpowerinformation:total/fundamentalactive/reactivepower,totalapparentpowerorsumofcurrentrmsvalues.TheADE7878h

5、aswaveformsampleregistersthatallowaccesstoallADCoutputs.Thedevicealsoincorporatespowerqualitymeasurementssuchasshortdurationloworhighvoltagedetections,shortdurationhighcurrentvariations,linevoltageperiodmeasurementandanglesbetweenphasevoltagesandcurrents.Twoserialinterfacescanbeusedtocommunicatewith

6、theADE7878:SPIorI2Cwhileadedicatedhighspeedinterface,HSDC(HighSpeedDataCapture)port,canbeusedinconjunctionwithI2CtoprovideaccesstotheADCoutputsandrealtimepowerinformation.TheADE7878hasalsotwointerruptrequestpins,IRQ0andIRQ1,toindicatethatanenabledinterrupteventhasoccurred.Threespeciallydesignedlowpo

7、wermodesensurethecontinuityoftheenergyaccumulationwhentheADE7878isintamperingsituation.TheADE7878isavailablein40-leadLFCSPleadfreepackage.ADE7878主要特性:Highlyaccurate;supportsEN50470-1,EN50470-3,IEC62053-21,IEC62053-22andIEC62053-23Compatiblewith3-phase,3or4wire(deltaorwye)andother3-phaseservicesSuppl

8、iestotal(fundamentalandharmonic)active/reactive/apparentenergyandfundamentalactive/reactiveenergyoneachphaseandontheoverallsystemLessthan0.1%errorinactiveandreactiveenergyoveradynamicrangeof1000to1at25CLessthan0.2%errorinactiveandreactiveenergyoveradynamicrangeof3000to1at25CSupportscurrenttransforme

9、randdi/dtcurrentsensorsDedicatedADCchannelfortheneutralcurrentinputLessthan0.1%errorinvoltageandcurrentrmsoveradynamicrangeof1000to1at25CSuppliessampledwaveformdataonall3phasesandneutralcurrentSelectableNo-loadthresholdlevelfortotalandfundamentalactiveandreactivepowersandforapparentpowersLowpowerbat

10、terymodemonitorsphasecurrentsforanti-tamperingdetectionPhaseanglemeasurementsinbothcurrentandvoltagechannelswithmax0.3errorWidesupplyvoltageoperation2.4to3.7VBatterysupplyinputformissingneutraloperationReference1.2V(drift10ppm/Ctyp)withexternaloverdrivecapabilitySingle3.3Vsupply40-LeadFrameChipScale

11、(LFCSP)LeadFreePackageOperatingtemperature-40to85CFlexibleI2C,SPI,HSDCserialinterfaces图1.ADE7878功能方框图图2.ADE7878总有功电量累加框图PFDISpr(nREWRPflUXin3T*TU-M|l1：aiOikilSgnjriPra-enur32b*tnpgnttc料Ki#阿AVO05AVA?lGMNToulPewtr片护fAm乘11如呵fK?RJIS2J：q，rfipflrjlar图3.ADE7878总无功电量累加框图图4.ADE7878表观功率数据流和表观功率累加框图*55Ml暮CJFxS

12、ELbininCFMODEfiEVP&UMxbitofSTATUSOpi:D|f呵呎杯卜csrCFkDENFUARWTHI54T：4订出TERHEEUtbrtsmVACHMPMOOEWATTFWATTDlplalSlffialPrK#5winiRantaneolb-pfiaseAtadiveInstantineLE-P*1fl5eElMllM-KisiununeouphasoCKtivit图5.ADE7878电量到频率转换框图ADE7878电表IC评估板EVAL-ADE7878EBEvaluationBoardDocumentationADE7878EnergyMeteringICEVAL-A

13、DE7878EBThisdocumentationdescribestheADE7878evaluationkithardware,firmwareandsoftwarefunctionality.TheevaluationboardcontainsanADE7878andaLPC2368microcontroller.TheADE7878anditsassociatedmeteringcomponentsareopticallyisolatedfromthemicrocontroller.ThemicrocontrollercommunicateswiththePCusingaUSBinte

14、rface.FirmwareupdatescanbeloadedusingonePCcomportandaregularserialcable.TheADE7878evaluationboardandthisdocumentation,togetherwiththeADE7878datasheetprovideacompleteevaluationplatformfortheADE7878.TheevaluationboardhasbeendesignedsothatADE7878canbeevaluatedinanenergymeter.Usingappropriatecurrenttran

15、sducers,theevaluationboardcanbeconnectedtoatestbenchorhighvoltage(240Vrms)testcircuit.On-boardresistordividersnetworksprovidetheattenuationforthelinevoltages.Thisapplicationnotedescribeshowthecurrenttransducersshouldbeconnectedforthebestperformance.Theevaluationboardrequirestwoexternal3.3Vpowersuppl

16、iesandtheappropriatecurrenttransducers.评估板EVAL-ADE7878EB主要特性:Evaluationboarddesignedtobeusedtogetherwithaccompanyingsoftwaretoimplementafullyfunctionalthree-phaseenergymeterEasyconnectionofvariousexternaltransducersviascrewterminalsEasymodificationofsignalconditioningcomponentsusingPCBsocketsLEDindi

17、catorsonlogicoutputsCF1,CF2,CF3,IRQ0,andIRQ1OpticallyisolatedmeteringcomponentsandUSBbasedcommunicationwithPCExternalvoltagereferenceoptionavailableforon-chipreferenceevaluationPCCOMport-basedfirmwareupdatesJ咆VNVCFCNDVBFGNDV护GNDVDOGNDTO2GUD2MCUVDOMOJGNDHPILPC23C5ADETfolFitera.顼舸LfllkmP5叵叵|PS亘回P7叵叵P8

18、|Zi|0JTAJ3InttrtaceD即询i&citalcjrsP9|6j|ej：?i2刑5CdrwTeWrK*PCCOMPar?空Rd&1N.JP2W-openJP3N.JP4N=closedJP5N.JP6N=openJP7A,JPSA=openJP7B,JP8B=openJP5A,JP6A=openJP36,JPB二doseciJP1QJP2C=openJP7C.JPBC=open图7.评估板EVAL-ADE7878EB的建立图8.评估板EVAL-ADE7878EB电路图(1)CiKJK图9.评估板EVAL-ADE7878EB电路图(2)图10.评估板EVAL-ADE7878EB电路图(3)评估板EVAL-ADE7878EB材料清单(BOM):8胸帕伽yiu*口神“|茁|*门AlACft28OARrZIC-ADI1.2ULHi.0WFOWtHHGHPSAftVOLIAEfA2贞OUMl笳0畑ICSWAPPABLECXIALISOLATORC1PC0X78lCKJFCAPIANI